Share-Based Compensation	3 Months Ended
Share-Based Compensation	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation The Company recorded approximately $7.6 million and $7.4 million of share-based compensation expense for the three months ended March 31, 2015 and March 31, 2014, respectively. As of March 31, 2015, there was approximately $40.9 million of total unrecognized compensation costs related to non-vested share-based employee compensation arrangements granted under the Company's equity compensation plans. The Company expects to recognize those costs over a weighted average period of 1.54 years. During the three months ended March 31, 2015, the Company issued a total of 727,467 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under the Company's 2010 employee stock purchase plan (ESPP). During the three months ended March 31, 2014, the Company issued a total of 614,851 shares of its common stock upon the exercise of stock options, pursuant to restricted stock grants and pursuant to purchases under the ESPP. Cash received from the exercise of stock options and purchases through the ESPP during the three months ended March 31, 2015 and March 31, 2014 was $12.0 million and $8.6 million, respectively, and is included within the financing activities section of the consolidated statements of cash flows.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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